ci: add harness file linter (#1549)

* ci: add harness file linter

* ci: address harness linter review feedback

* ci: cover codex harness config linting

* ci: tighten harness lint opt-ins

* ci: expand harness lint coverage

* ci: address harness linter review feedback

* ci: fix harness linter review followups

* ci: lint claude settings harness config

* ci: tighten harness linter coverage

* ci: fail malformed harness toml

---------

Co-authored-by: root <root@kandev.ts.net>

.pre-commit-config.yaml

@@ -9,6 +9,15 @@ repos:
         stages: [commit-msg]
         always_run: true
 
+  # Harness guidance hooks
+  - repo: local
+    hooks:
+      - id: harness-lint
+        name: Harness file lint
+        entry: python3 .github/scripts/lint-harness-files.py
+        language: system
+        pass_filenames: true
+
   # Backend (Go) hooks
   - repo: local
     hooks: